Patents Examined by Makoto Aoki
  • Patent number: 6349209
    Abstract: An easy to use (easy-reach) dialing system that connects a calling party with a called party based on data received over a first communication channel and a second communication channel. A calling party calls an easy-reach device and sends data to the easy-reach device over a second communication channel. The easy-reach device calls the called party based on data received over the second communication channel and connects the calling party with the called party.
    Type: Grant
    Filed: September 23, 1997
    Date of Patent: February 19, 2002
    Assignee: AT&T Corporation
    Inventors: Mark Jeffrey Foladare, Shelley B. Goldman, David Phillip Silverman, Robert S. Westrich
  • Patent number: 6256501
    Abstract: In a cellular mobile telecommunications system, upon a hand-off request signal generated by a mobile station, the base station control office transfers traffic data to both the base station to which the mobile station is presently connected and another base station to which the present base station is adjacent. A hand-off order message is transferred from the present base station toward the mobile station. The control office is adapted to control the adjacent base station to transmit the hand-off order message if it fails to receive a hand-off confirmation from the mobile station.
    Type: Grant
    Filed: June 30, 1998
    Date of Patent: July 3, 2001
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Katsumi Tokuyama, Katsutoshi Itoh
  • Patent number: 6249670
    Abstract: A signal combining device and method allows a mobile unit to use a single antenna to receive and transmit information in two or more frequency ranges. The combining device includes a first and second transmitting circuits and a first and second receiving circuits, which are connected to a matching device. The matching device, in turn, is connected to the antenna. The first transmitting circuit and the first receiving circuit are designed to transmit and receive, respectively, a digital signal, and the second transmitting circuit and the second receiving circuit are designed to transmit and receive, respectively, an analogue or a digital signal. By using the signal combining device it is possible to combine signals of different frequency bands, especially digital signals and analogue signals of different frequency bands. As such, the present invention allows for the use of a common antenna in a dual mode radio.
    Type: Grant
    Filed: April 30, 1997
    Date of Patent: June 19, 2001
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Lars Peter K√ľnkel, Karl-Johan Fagerstr√∂m
  • Patent number: 6243576
    Abstract: A radio communication analyzer can test a radio device under test which corresponds to one of a plurality of types of digital communication systems in accordance with the digital communication system to which the radio device under test corresponds. The radio communication analyzer includes a modulation section, a demodulation section, a modulation/demodulation processing section, and a control section. The modulation section has a first rewritable memory, and converts modulation data indicating the contents of a first test signal to be transmitted to the radio device under test into a digital modulated signal by executing a program written in the first memory. The demodulation section has a second rewritable memory, and generates demodulated data from a second test signal received from the radio device under test by executing a program written in the second memory. The modulation/demodulation processing section has a third memory.
    Type: Grant
    Filed: July 26, 1999
    Date of Patent: June 5, 2001
    Assignee: Anritsu Corporation
    Inventors: Takashi Seike, Yuji Honma, Takayuki Saito, Mamoru Akada
  • Patent number: 6223061
    Abstract: An apparatus for low power radio communication comprising a transmitter having a frequency synthesizer and transmit antenna such that the frequency synthesizer comprises a phase locked loop circuit with a voltage controlled oscillator having a variable frequency output and with a loop filter/sample and hold circuit that allows opening of the synthesizer control loop and with special means of limiting the resulting frequency drift in the open loop state. The transmitter produces an output signal and the loop filter/sample and hold circuit holds the voltage controlled oscillator substantially on frequency such that the output signal remains stable, with a minimum of frequency drift, over a period of time when the phase lock loop synthesizer is set to an open loop state to allow frequency modulation unimpeded by the normal frequency correcting action of the synthesizer and for the frequency synthesizer to be partially powered down to reduce power consumption.
    Type: Grant
    Filed: July 25, 1997
    Date of Patent: April 24, 2001
    Assignee: Cleveland Medical Devices Inc.
    Inventors: Farron L. Dacus, Robert N. Schmidt, Steven P. Hendrix
  • Patent number: 6198917
    Abstract: A method of updating mobility information for a Mobile End System (MES) in a Cellular Digital Packet Data network uniquely identifies a Serving Mobile Data Intermediate System (MDIS) in a ReDirect Request (RDR) so that the Location Update Service (LUS) can complete its location updating operations. Upon attachment of the MES to the Serving MDIS, a RDR is created that includes a LUS address of the Serving MDIS and a Forwarding Service address (FSA) of the Serving MDIS. The RDR is then transmitted to a Home MDIS corresponding to the MES via a network backbone. The Forwarding Service address of the MES is then updated to the Forwarding Service address of the Serving MDIS. Then, the Home MDIS creates an RDC that includes as a destination address the LUS address of the Serving MDIS and transmits to the RDC to the Serving MDIS via the network backbone. Once the LUS operations are complete, data intended for the MES received at the Home MDIS is routed based upon the FSA of the Serving MDIS.
    Type: Grant
    Filed: July 8, 1998
    Date of Patent: March 6, 2001
    Assignee: Nortel Networks Ltd.
    Inventors: Cecil L. Taylor, Patricia A. Landgren
  • Patent number: 6192229
    Abstract: In a diode mixer circuit MIX, a driving circuit DRIV produces a first, second, third and fourth drive signal DS1, DS2, DS3, DS4. Each drive signal is a combination of a first and a second input signal LO, RF with the following signs: DS1: +LO+RF DS2: +LO−RF DS3: −LO+RF DS4: −LO−RF A first, second, third and fourth diode D1, D2, D3, D4 transfer the first, second, third and fourth drive signal DS1, DS2, DS3, DS4 respectively, to an output O1. The first and fourth diodes D1, D4 have the same polarity relative to the output. The second and third diodes D2, D3 also have the same polarity relative to the output, but opposite to that of the first and fourth diodes D1, D4. A mixer circuit of this type is suitable for a relatively large variety of applications, notably because it may be realized in the form of an integrated circuit.
    Type: Grant
    Filed: December 8, 1998
    Date of Patent: February 20, 2001
    Assignee: U.S. Philips Corporation
    Inventors: Eduard F. Stikvoort, Petrus G. M. Baltus, Antoon M. H. Tombeur
  • Patent number: 6192246
    Abstract: Provided is a system and method for optimizing the performance of the cellular network by maintaining status values concerning the cell and adjusting the conditions for handoff in response to the status values. The status values may include a pilot signal strength measurement for the second cell, a round trip delay measurement from the second cell to the mobile unit, an a designation of whether the second cell is current, removed, or most recently removed. With the status values, a determination can be made to remove the second cell from the mobile unit's Active Set if either the pilot signal strength for the second cell falls below a predetermined threshold or the round trip delay value exceeds a predetermined maximum.
    Type: Grant
    Filed: April 9, 1999
    Date of Patent: February 20, 2001
    Assignee: Nortel Networks Limited
    Inventor: Prasanna Jayaraj Satarasinghe
  • Patent number: 6192217
    Abstract: A practicable universal replacement C band/Ku band communications satellite designed for orbiting the Earth in a storage orbit and a method for its use as a replacement for a failed satellite are disclosed. The universal replacement satellite can be controlled by an external control system (e.g., a ground station) and is reconfigurable by remote command (e.g., from a ground station). The satellite is designed to make several fast moves during its design life from its storage slot to the geostationary slot to which it needs to move when it is to act as a replacement for a failed satellite. The ability to make fast moves helps minimize down time. After its then-current mission of sparing a particular failed satellite has been completed, the communications payload can be turned off and the satellite can be moved back to its storage slot to await its next replacement mission.
    Type: Grant
    Filed: July 1, 1999
    Date of Patent: February 20, 2001
    Assignee: AssureSat, Inc.
    Inventor: Jerald F. Farrell
  • Patent number: 6185420
    Abstract: In a Code Division Multiple Access (CDMA) Mobile Communication System, a method for testing the functionality of a call control processing program executed on a call control processor in a base station controller comprises simulating a mobile switching center that exchanges communications with the base station controller. The functionality of the call control processing program is tested by using the simulated mobile switching center.
    Type: Grant
    Filed: July 1, 1998
    Date of Patent: February 6, 2001
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Hyuk-Jung Choi
  • Patent number: 6181950
    Abstract: A coplanar antenna connector which interconnects an antenna and a printed circuit board of a portable radiotelephone is described. In particular, the antenna connector includes an antenna connector conductor strip having opposing first and second ends adapted for transmitting a radiotelephone signal from a source to an antenna or from an antenna to a receiver. The connector also includes at least one antenna connector ground strip having first and second opposing ends adapted for transmitting a radiotelephone signal. The at least one antenna connector ground strip and the antenna connector conductor strip are held in coplanar alignment, preferably by a nonconducting carrier ribbon. Each of the at least one antenna connector ground strips and the antenna connector conductor strip are spaced-apart and define a gap therebetween.
    Type: Grant
    Filed: April 26, 1999
    Date of Patent: January 30, 2001
    Assignee: Ericsson Inc.
    Inventor: Gregory S. Mendolia
  • Patent number: 6178328
    Abstract: A method and system for use with wireless communications systems having a plurality of groups of channels, and wherein the method and system assign specific groups of channels such that channel interference is minimized. The method and system accomplish their objects via the use of communications equipment adapted to do the following: define a geographic area; map the defined geographic area with at least one high bandwidth cell cluster wherein each cell has at least one sector; and eliminate channel adjacencies by selectively assigning channels, drawn from the plurality of groups of channels, to the at least one high bandwidth cell cluster.
    Type: Grant
    Filed: June 11, 1998
    Date of Patent: January 23, 2001
    Assignee: Nortel Networks Corporation
    Inventors: Yuqiang Tang, Roderick Djurkovic
  • Patent number: 6178309
    Abstract: In a radio device, a switch 2 is disposed between a power amplifier 1 and an antenna 3, and during production of the radio device, the switch 2 is connected to a power meter 14. A battery voltage or a detection voltage corresponding to a predetermined transmission power is measured, and then stored as a comparison voltage in a memory 9. In use, the battery voltage or the detection voltage is compared with the comparison voltage, and upon detection of a low voltage, this fact is announced from a speaker 11 to a user.
    Type: Grant
    Filed: September 16, 1997
    Date of Patent: January 23, 2001
    Assignee: NEC Corporation
    Inventor: Tamiyuki Mizoguchi
  • Patent number: 6178321
    Abstract: An wireless communication system has a master station and a slave station. The master and slave stations exchange identification signals and call signals, and include a cut-off unit for cutting off the call signals during reception of the identification signals. The cut-off unit of the master station generates a master cut-off signal after transmission of a master identification signal to the slave station. The slave station transmits to the master station a slave identification signal in response to reception of the master identification signal so that the master cut-off signal is aligned with the slave identification signal received by the master station. The cut-off unit of the slave station generates a slave cut-off signal for alignment with the reception of the master identification signal. The slave station includes a differential circuit and a correction circuit.
    Type: Grant
    Filed: September 22, 1998
    Date of Patent: January 23, 2001
    Assignee: U.S. Philips Corporation
    Inventors: Michel Auffray, Yannick Le Nue
  • Patent number: 6175724
    Abstract: The RF section of a communication device (100) includes a receiver (106), a transmitter (108), first injection frequency generation circuit (120), and an intermediate frequency (IF) generation circuit (124). The IF generation circuit has a shared output coupled to both the receiver and transmitter, as well as a control circuit (118) for feedback control purposes. The IF generation circuit is used to generate IF for both the receiver and transmitter, thus using fewer components that two separate IF generation circuits. It includes two differently tuned voltage controlled oscillators (202, 204) which are selectively and exclusively powered by first and second power switches (234, 236), respectively. The control circuit provides a single control voltage corresponding to a desired frequency pair to both VCOs at a common control input, then selects the appropriate VCO depending on whether the communication device is receiving or transmitting.
    Type: Grant
    Filed: July 31, 1998
    Date of Patent: January 16, 2001
    Assignee: Motorola, Inc.
    Inventors: David H. Minasi, Gustavo D. Leizerovich, Peter J. Yeh
  • Patent number: 6173160
    Abstract: In accordance with a method of this invention, and circuitry for performing the method, there is disclosed a process for operating a radio frequency (RF) signal power detector. The method includes the steps of (a) sampling the output of an RF detector circuit to obtain a measurement of a value of the output when no RF signal is input to the RF detector circuit; (b) storing the measurement; and (c) subtracting, when an RF signal is input to the RF detector circuit, the stored measurement from the output of the RF detector circuit to provide a subtracted output signal. In pulsed (e.g., TDMA) embodiments of this invention the step of sampling occurs between RF bursts, while in continuous wave (cw) embodiments the step of sampling occurs during a time that an RF connection is opened or otherwise blocked at an input of the RF detector circuit and a source of the RF signal.
    Type: Grant
    Filed: November 18, 1996
    Date of Patent: January 9, 2001
    Assignee: Nokia Mobile Phones Limited
    Inventor: Jukka Liimatainen
  • Patent number: 6173192
    Abstract: A system for automatically tuning the radio equipment of an aircraft in response to a verbal communication to the system.
    Type: Grant
    Filed: October 1, 1996
    Date of Patent: January 9, 2001
    Assignee: Honeywell International Inc.
    Inventor: Larry K. Clark
  • Patent number: 6169889
    Abstract: An electronic device has reduced radio frequency interference (RFI) emissions. The electronic device includes a signal generator that is coupled to a reference clock signal and a first digital circuit. The signal generator generates a random signal derived from the reference clock signal. The first digital circuit is coupled to the signal generator. The random signal governs pulse characteristics of the first digital circuit.
    Type: Grant
    Filed: August 4, 1997
    Date of Patent: January 2, 2001
    Assignee: Motorola
    Inventors: Mark L. Servilio, Michael J. DeLuca, Edgar Herbert Callaway, Jr.
  • Patent number: 6169882
    Abstract: A radio display pager receives an addressed paging signal containing a message which may be accompanied by a predetermined parameter such as telephone number. The pager stores the message into a memory as a normal message if it is not accompanied by the parameter or stores it as an important message if it is accompanied by the parameter. If the memory is full, the pager removes an oldest normal message from the memory if the memory contains at least one normal message, and removes an oldest important message from the memory if the memory contains only the important messages.
    Type: Grant
    Filed: December 18, 1997
    Date of Patent: January 2, 2001
    Assignee: NEC Corporation
    Inventor: Sadayuki Amma
  • Patent number: 6167284
    Abstract: A converter device with a symmetrical device input and an asymmetrical device output has a transconductance input module that converts the device input voltage to an output current. A resistive module transforms the output current into a voltage referenced a predetermined potential. The transconductance input module has two transistors forming a differential pair and a subtracter connected between the differential pair outputs and the resistive module. The subtracter has three current mirrors and provides the resistive module with a current which is the difference between transfer currents of the two transistors of the differential pair. A second differential pair is provided between the device input and the first differential pair.
    Type: Grant
    Filed: September 22, 1998
    Date of Patent: December 26, 2000
    Assignee: U.S. Philips Corporation
    Inventor: Nigel Greer